I've been having kind of a running battle with headaches, most notably a couple of weeks ago when they were of the pulsing, head-in-a-vice variety. After getting checked out today, it looks like a double whammy of sinus problems and glasses which are too strong. The former I'd suspected; the latter I hardly expected. The headaches were worse when I wore my glasses, but I'd worn them steadily for some time without real problems.

So after a quick course of medication and new lenses, I should be OK. Keep your fingers crossed.